If you do go with an aftermarket muffler...go with something straight through, not a chambered design. That will aid in more performace, not just sound.

This will allow for reduced turbine backpressure (which is what you want... zero pressure aft turbo, high pressure preturbo) to allow for more high RPM power. Probably 2800-4500

I doubt you'll see it spool much quicker as there's not much of anything I see that would cause big turbo lag such as precats or a highly restrictive intake setup.

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

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